Portable compiler: fix build

Add a missing #include to pick up Quick backend refactoring changes.

Change-Id: I301dcaa90a8322631ea91860e69b48ad2fa2be24
diff --git a/src/compiler_llvm/gbc_expander.cc b/src/compiler_llvm/gbc_expander.cc
index f881e70..57a13d5 100644
--- a/src/compiler_llvm/gbc_expander.cc
+++ b/src/compiler_llvm/gbc_expander.cc
@@ -25,6 +25,7 @@
 #include "verifier/method_verifier.h"
 
 #include "compiler/compiler_ir.h"
+#include "compiler/codegen/codegen.h"
 using art::kMIRIgnoreNullCheck;
 using art::kMIRIgnoreRangeCheck;